Chuck for rock drills



W. A. SMITH CHUCK FOR ROCK DRILLS Nov. 1926.

Filed 061. 10 1925 H/S ATTOREK,

Patented Nov. 2, 1926.

UNITED STATES- PATENT OFFICE.

WILLIAM A. SMITH, OF ATHENS, PENNSYLVANIA, ASSIGNOR 'TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

canon ron ROCK Dams.

Application mar- October 10, 1925. Serial No. 61,825.

This invention relates to fluid actuated rock drills, of the hammer type, but more of the chuck.

The invention is shown in one. of its preferred' forms in the accompanylng drawing, which 1s a longitudinal sectional elevatlon I partly broken away of so much of the rock drill as will serve to illustrate the invention.

- The invention is shown as applied to a rock drill having rifle bar rotation and the rock drill comprises the c linder A having the reciprocating piston adapted to impart blows of impact to the drill steel C shown in this instance as a lugged steel having the lugs D. Pressure fluid is suplied to the rock drill from the supply pipe and the usual throttle valve is provided having the handle F. The automatic dis tribution valve in the valve chest G is indicated as being of the type shown in my said copending application, Serial No. 737,- 510.

In accordance with this invention, the cylinder A is provided with an internal forward integral shoulder H and an external integral flange J intermediate the shoulder H and the. front end K of the cylinder. A separate removable front cylinder washer L is located in the cylinder rearwardly of the shoulder H and a chuck nut U is located in the cylinder forwardly of said shoulder H and adapted to abut against said shoulder. The piston B is provided with the forward fluted extension P cooperating with the chuck nut-O for rotation purposes.

A rotation sleeve Q is clutched ,to said chuck nut 0 at a point within the forward end of the cylinder as shown by the dotted lines indicatlng the clutch jaws R and this rotation sleeve has an external flange S adapted to abut a ainst the front end K of the cylinder an is also provided with an internal shoulder T at its rearward end.

A chuck bushing U in said rotation sleeve Q abuts against the shoulder T, and a chuck key V is clutched to said rotation sleeve by v the jaws W.

The front head X has a rearward en-f larged portion Y formed with an enlarged bore within which the said external flange S on the rotation sleeve Q lies, and into which the forward end K of the cylinder extends, so that the rearward end a of the front head X bears against the external flange d at the forward end of the cylinder.

Sufficient clearance is provided between the shoulder 5 within the rearward end of the front head andthe front end K of the cylinder to permit free rotation of the chuck sleeve, any suitable means (not shown) being provided for oiling this portion of the chuck.

In accordance with this construction, the rotation sleeveQ has a bearing within and is guided by the integral forward end of the cylinder at the oint 0. The cylinder at this point is provided with the external flange J which affords a reenforcement and also forms a bearing for the rearward end of the front head X. The longitudinal movement or play of the sleeve Q is limited between the shoulder b of the front head and the front end K of the cylinder and owing to the fact that the rearward enlar ed portion Y of the front head extends outside of the rotation sleeve flange S, the parts are reenforced against side strains at this point.

I claim: 1 In a fluid actuated rock mer type having rifle bar rotation, the combination of a cylinder having an internal forward integral shoulder and an external integral flange intermediate said shoulder and the front end of the cylinder, a separate removable front cylinder washer rearwardly of said integral shoulder, a chuck nut in the cylinderforwardly of said shoulder adapted to abut against said shoulder, a reciprocatory piston havinga forward fluted extension cooperating with. said chuck nut, a rotation sleeve clutched to said chuck nut within the forward end ofthe cylinder and having an external flange adapted to abut against the front end of the cylinder and also provided with an internal shoulder at its rearward end, a chuck busg in said' drill of the as...

2 rename rotation sleeve abutting a 'ainst said interward end 0% the cylinder extends, said nal rotation sleeve shoulder, a chuck key rearward portion of the front head bearing clutched to the said rotation sleeve, and it against the external flange on the cylinder. 10 front head having a rearward portion In testimony whereof I have signed this formed with an enlarged bore within which specification.

the said external flange on the rotation sleeve lies and into which the integral for- LIAM A. SMITH. 

